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Yellowstone National Park is America's first national park and a center for "geothermal," or volcanic activity. Here, visitors can watch Old Faithful Geyser, which shoots 8,000 gallons of water 1,000 feet in the air every hour and a half. Yellowstone, nestled mostly in Wyoming, contains half the geothermal surface activity on the planet, and two-thirds of the world's geysers.